{"cve":"CVE-2026-73501","nvd":{"published":"2026-08-12T22:17:17.443","modified":"2026-10-24T15:10:00.190","status":"Deferred","description":"kin-openapi is a Go project for handling OpenAPI files. Prior to 0.144.0, ValidationHandler.Load() in openapi3filter/validation_handler.go silently replaces a nil AuthenticationFunc with NoopAuthenticationFunc, which returns nil without checking credentials. This substitution causes every OpenAPI security requirement to be satisfied for unauthenticated requests when an application relies on ValidationHandler as its enforcement middleware. The no-op callback prevents the fail-closed ErrAuthenticationServiceMissing path from being reached and forwards the request to protected handlers that may require an API key, OAuth token, or another security scheme. This issue is fixed in version 0.144.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-287"],"references":["https://github.com/getkin/kin-openapi/commit/f0407d53b0730280266f454b755010e7eeb985da","https://github.com/getkin/kin-openapi/releases/tag/v0.144.0","https://github.com/getkin/kin-openapi/security/advisories/GHSA-r277-6w6q-xmqw","https://github.com/getkin/kin-openapi/security/advisories/GHSA-r277-6w6q-xmqw"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73501","score":0.00426,"percentile":0.36606,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-r277-6w6q-xmqw","url":"https://osv.dev/vulnerability/GHSA-r277-6w6q-xmqw","summary":"kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default","modified":"2026-09-10T03:50:52.909683602Z","packages":[{"ecosystem":"Go","name":"github.com/getkin/kin-openapi","purl":"pkg:golang/github.com/getkin/kin-openapi","ranges":["<0.144.0"],"fixed":["0.144.0"]}]},{"id":"GO-2026-6095","url":"https://osv.dev/vulnerability/GO-2026-6095","summary":"Authentication bypass via default NoopAuthenticationFunc in github.com/getkin/kin-openapi","modified":"2026-09-06T03:25:56.746350332Z","packages":[{"ecosystem":"Go","name":"github.com/getkin/kin-openapi","purl":"pkg:golang/github.com/getkin/kin-openapi","ranges":["<0.144.0"],"fixed":["0.144.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}